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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8abd7812f8c451d9afeb4eb040bcfde8fb9d63480d0fef245d3bafa5b7b432' 
  AND token = 'wmnnJ9s5QyMgcid95nebi3W2sFz381KXRoYb4roBT7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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