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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98de6f11741d7e284572a8eae17fe2ddb2ced66939fb96b93019167110ff17b' 
  AND token = '1Xkx6r1xk0RVeNBAL/UGrK8zeeZM+HGusqAPf9pGG6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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