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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bd2c93ff9a63809f6082e90052e7ea03de7fd05ecc0544e26e4b53bcf403c4' 
  AND token = '4u7Hbim3QR5Z0ITzJAQotZGALzc/IXBW8ZlkM/8PBFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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