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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdff8e17a8844a3924ff58ee6c37ea0b78185e557e62bb1fd48c8c145b40af2' 
  AND token = '70GLjAVy9KRHmkJanur/dCmzrhD12bFOX980CqwcT6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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