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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1b1ecc8c5feb3082eeab250277f4f7810ad627d17ba188c317b7e314801fa7' 
  AND token = '3abdonXa1k9yOrt1Z4t3+XkcPrOmyiB1kygw8dU3U20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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