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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baddab43ddaf526043364ceca86ecaae9fbde2d0d028a5d08339b5bf6132925e' 
  AND token = 'm+bS0E5MEVlYLcwvn2peG+nZx9wLy13A9AEb0Ud3n4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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