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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e11967ca4a7f70d339dbe80a99d2df53c026b3c2944543152a7a6dc6b5f57c' 
  AND token = 'CbMI+8XhhYJQmaAieYXVjBgcsMXmV22954i9XQTx+wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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