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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d31ecb184af5058a0f217211bad8737987bc0bc8420130a4ac7b2e71fb9835b' 
  AND token = '/42Zt9ncmRvydRutyyp79W5AfkCGUKT8d24ha6ZETVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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