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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6690ba647211341215754eb4d31de897640f18d6d1c70db4a2c669ed87b59e26' 
  AND token = 'KwBS1WpBT7b9CN2H80tsyYXcCoiB0joPCmaPmIcP7Kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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