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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c06cd38c30dc523ea4995145b6cbd8a22bea4fb95c9f617e1f40e9ba7b168ee' 
  AND token = 'xvPO1adlCSlkdxddUvXMcqNa/pfwBRjR34PtNk9T9ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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