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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287770de78a08c4bb79982b458d0302180fe8f8de1e40130bcc92579a26fc80c' 
  AND token = 'EY6N/ZqDAeJQSQEeuxCjU97J47gwD44eEaYLghzG8y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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