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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bfb2091efeb8edc6c45ca82442ea6a7ecd7f585fa4aa14d51361268eafb092' 
  AND token = 'cnZCZxgY1zW7Q3lti/ici6qQ2BKdtSf9HvclOi69sHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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