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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b823210789c7eba43da1b3295295cf7cb9b2504d659372ca4a94031cec1852' 
  AND token = 'LvRNIQMDWvXu89FQzmivK1Lcu2l9nh/s1/59kKkBbzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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