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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd124185f1956cd9d86b64f5a1f61a5fa5739803d31d3550cb8112737571965a8' 
  AND token = 'agxkgIt8rrZ32/4zS4h6KV8nmDS45Jupn0OJf/dVzxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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