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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b8c37cb70c9c33264f14e4add0315c823a8a678f6d4fdc06549f8f5bdc58f0' 
  AND token = 'atTyDyIbnJo2LZuxU1ZN4h5DT6CCzIzq1HWIqw2fww0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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