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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e9a6cb75388a5e41cd0c295952c944dbd2d81393473107f1c31483406e1a7f' 
  AND token = 's12QvK8a8gUHtBFk7oUj9iudX9lTYIIO44br2ELCqEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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