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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63146b905e68c1216219b0e931306fe4d3ffe2588fb1d8a46d632a992d2fa373' 
  AND token = '9o1XaRZzHA0hMcC4ifDND0exRZjIGN0L9OZSCpTIQMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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