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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ccf259d7f303fc6ef0a334d5df949ea7fc64a9da4f3b873892636546b43d0f' 
  AND token = '3TQ5zA3M5z1cPth1vYrMyIbaah2q/jeIK0Tjc83U7kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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