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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f555f828894365848fade5221b2dc30d2941bc838506ccf71e2c2720f47f200f' 
  AND token = 'OjTY2gG31Qe+wMbJ8odG4HUI8IkMV/lIzWISsd9no5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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