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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd26f79491815097f362e25f456f9aefc393fc21a66b94319a30ab88f049ba5e' 
  AND token = 'amCPQYM99V3I1qZ84o+YzDeVI5Ff/mfCKodFqCuz89M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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