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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc7292663445164a02988f6d6610f94890cab5b7b221840d12600d05b52afca' 
  AND token = '/WoBFr2SOYH8wOdxrk8H12bsiW4k2ePUZfM1Qfa04ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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