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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313f9c793de0b23b7e3c62a0a8c0abf84d961c6447e0625ac2ef4914087976c1' 
  AND token = 'WCanYhnvYNQZKyVbase97iQOOUDQ6N8kGt64J/GUglM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}