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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04960c67e3377fd5510018184d4c5a885ae9626364b8d08f89f1af8a2f7a49c9' 
  AND token = 'R9Etv7Ff5jMIZCcgck/O6yU6XSWbxB7uC1/dBQbmaLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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