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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081665ea44b47f18ccc94405dcfc75f25d117feefa8234c403c7d57b9ad4e9e6' 
  AND token = 'ASovGUu8f7I4ZE12U9/7lw9L7+t1UK/wA/bn1pZhXTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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