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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67b483fae578bd5dfc9999226affb668f32c8664611c52c31960fb60d6d3262' 
  AND token = 'k+Fd2spzZ/IklCjUk4v97sqjLDua+CdFJsE7IMRf+SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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