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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f211306f90caac305314fda05426e8b91257c5a6da56272eff2a62505d317c1' 
  AND token = 'kyz/D9LR4pL7zvhcG9D8SsbeQ4hKyr1GalMZ9o7oSrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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