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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2ce99f6c14024b6d957fe931587e5f8dd480dff63137b07b48f280ac6cae3c' 
  AND token = 'R8pugOuefWyu1RQSaiwu3Phc82CLjSGhdvssPbSbayU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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