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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d35a1d2b368a4bab80bda7ad80652fc61b94ec7b5d30f810bf81acf4d3f261' 
  AND token = '9NKLxqrT2ovgqRJQ/pX7J20wbankFWAa/WxXTtyoDu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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