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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2985651aef3a97d0b01147aaec766c3992e41e3ce00e9731a694fa7dd22e54d2' 
  AND token = 'lfHyHWqdVJHWRiNSy4zj6u+GLEacsTkj+IUNffXP97w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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