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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d5fdb5a36b93d6a4e9a4eb8059e2ac8d566b8117104af8b9b999553e2d1b16' 
  AND token = 'IXihL72C+kAlo3y+8OtWp/QwPO1AhbP6EEa9JghHbSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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