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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e2a949259a3ef1942da53d88dda29abbab3300437ac9b9941888b83a81134c' 
  AND token = '/hh6KbVEpNj5zEAEb6h8OEvyj3vP/mR/sMPJm/SNGq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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