SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc09784a885f286294638f0c1a6b7caf86eb24079ff3b3cc9248d30970edbcb1' 
  AND token = 'J/LjIxuLGTNLeZwBLiLY+Op4Cd5w50gXye7cSH3MJYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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