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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd9a5bb0c669f7301cf62d1a616b55207197ecc3cc80c07ac4ca5018f87454d' 
  AND token = 'DsiMsUE/az95B9wHSTnHBiIeu7kul+peSe6lpFA3ByY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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