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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6ad1ed51774d7849f50962eed572e3ab2f689b7921a7482f1d365035c275d5' 
  AND token = 'QNEfmgsl9AS9wQTOyFJ/wOwCXYb9LwiD3wnxmnPZPZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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