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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39426520e3cbe91ed5d04b93f926ad88290c4c5835a106422202bbef34cd7d1b' 
  AND token = '97zcWAfi6FI8z2DV7tyjZmxjENDXNpzzW2Zkal2x4xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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