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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396c5979335e6069075cbf190cd9b403ffc233ab196b3b9667ed4c08ab929ddb' 
  AND token = 'BFjLvBgp4lNg5Me129cieAKU0F+aFi6ZvX9JQFpfx2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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