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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110679e7208b5dd363c93dfc506147d6824925c35f7b46a913cff43be5bf9b14' 
  AND token = 'cd2IS3fmyl7aMFovf82d9qg7P+Am82bEWU9J8NBMjWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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