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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13282bb7144968b183d95e4ae0f26a4ea9915c338b1d4f9fc133c4fb759b44e6' 
  AND token = 'SO9wQPs+l3QxhLaEyd0SF8zDO9fc6VHps2L4PYeJTyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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