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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0a32e61b105650d67d79ec5a2b87b189d092e02335bbf40515f061fcec759d' 
  AND token = 'nqn8xp0txbjWef3nM+PwU9BN2OFvjRp8QyMEgGO0L/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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