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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d82368eff53d4ded224ddfabd1f835f4352f889a23f6a9f8f9d3c81ea96f8f' 
  AND token = 'ebQcpJNyj+v+RJi9WLtBIfKMogImnpIVI+L5LNb8vqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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