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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8029be94bd8fe71e0819c7292ce67800fd4c80d366e1b5ca576a09a43d82b71' 
  AND token = 'pwHwKhHLl4J2pHMiIr9A+pFXcwIDpV8UmsZ01m44OtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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