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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85047c1bf8b7df00a82e28a9229b9101625b744596c741e987d40c5ac268562d' 
  AND token = 'm5RUxCu44O4/Jt0A5SoC+1ALadm5CJ3yLAy2oG0Gj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00116

JSON explain

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