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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d858e174592c0d53a3cdce148301781f46e59a77c6d2c35ab78100a36b6d6d' 
  AND token = 'TcekCxbS/JoU97+kuIhFBAxPakNF9ysn6QfomfCT3t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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