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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d03d8bf32aadb1db7a8447d7bfce6637bca20d42286ba26d6d1e154ed6b4da8' 
  AND token = 'EZhUlNfj6GDXSFRz+UQ3f5D1jI1kILoP7s2cW5MQLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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