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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9447b949d1841d1708f2ba33c5738ffa279b4d21d73ad5c77588fd3411a99a' 
  AND token = 'ze9Ug9tDE74EJFYeN7mMX769WOLOdyfpuMahIQcOq3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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