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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0496b0bf99e6f9a8a770ad5ae0691e91f61de16719dd2684552bf6b2ba35a5f' 
  AND token = 'yslXo31qjvhM+geMvp8bajpHw4/ilUPjVyCbiyjz8E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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