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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035aadc018d18fc539335051e62b2460d9eb87a79fd6a1aa2636509e65e11e3f' 
  AND token = '3K5dDBc4yfWRuyh61bCC2dywpu7tYzIvPHW1G8UqknM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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