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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5334186a8416c3ad3e35a2638cdf46b66d1583fde33d5321cc4991fe2e030ce7' 
  AND token = 'jWkBvCHTc0QrZLgid83995QUC0VBdnnad4Cqp2l4nxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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