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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d15328e73221b6d66f789784311127015ca4e8b1e870c26034a49db6b3cfdf' 
  AND token = 'JS2hjsVkRRkTXBpU38WU7wVZ1wHxR19Gkio41+qsGck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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