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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c808cb147d44144adeecf2b1dc9e42bd56b44fba24cf091bb81921a1f0b02b3' 
  AND token = 'xdrsu3Dq86P1b6Sor46PC6x5foMQdj4u+ew4PVv/qTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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