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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e274afbe32858afe4866163e82166964876b3b4988eec34824842a5aac3964' 
  AND token = '3YzzO51Yk1ia5Sc1kk5e+XSvqIM+uYAb3jxHpqL98Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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