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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f339ddb18450dae6ee7a01f68dfbfbcce03ea98d74e87d5bc76b9cdb2497683' 
  AND token = 'Wym7bAx7AKUNDiQNwX9hcN8AmeG5ZhUyZhm7C7iiIok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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