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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14643a5c652c463a288508329158615f5acd4385b39079652d99170189abbb26' 
  AND token = 'n3CARdO4SCCTxUMP51iKV3xxhj1WFQN42i143wI5hic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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