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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1625663c7b32f73c45296bd0c7da881327a874fab9d1d93285f24feca80f4f13' 
  AND token = 'JN/XW1Ugszj2GsOni4ib0VdOm5HgrrV+wisb1D5y/78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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