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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b63264915f69db4e60afe70f4fbeb9d338691520d0bd8243474938b1a6d961' 
  AND token = '1STnzg8itST5uI7kyBcUb3Oarfri79wwsJtVSvQlRD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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