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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e2401ac86425766a7a8f06a27c6f71e01cc29e16b78801b24d836f185cd8af' 
  AND token = 'xoHZ1R/pYJ0Sz/UBWF99pIuO0iF5ZdRKe+Bw9yv9A10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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