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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25215f4c811720b343055fab8422f10576b5c7c90c24f8216fef663d2ca315bc' 
  AND token = 'LXjUROM2fd5ODrkAZ53Zqy4AO2zAPM7VRj6LHHUki+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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