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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17133521857edb3e875973bef8c8c957054ab032cd6459486f82fd6478972e3' 
  AND token = 'kkMmimX0IUzWbiSJvpW1KZ5MDkr4x30Su1JvFIUGoCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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