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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f3a96bb72c4aaf7da085065ea9531fc90b168be43ee8632a08b97b17ae7341' 
  AND token = '8cygxuzuzt59DVJE+D3QS0uPR6DuZ8SVhz1quwY5oRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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