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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01b2b5e2e28bf4691b8bf3f1eacaa3d8f8d57ed0d535ce36a4e013e0b0f5898' 
  AND token = 'jxV7qd/qaIJfeEIpWF4YhAzZqvt/hbPW3y2AsT/tOz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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