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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8046287418bb703fa968d2fbf0502a1ad9fd72b77ae97b6c8b41fe2e4ce1caa2' 
  AND token = 'QW450AJcv8Mnf7q7k6X/5M3SYI6IhyCjD7ArFNsWDlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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