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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac040399ccd81d02a161b7b43305ad9a9d791dd3db5f591c355236c61125680' 
  AND token = 'hFCEg7/Op83bY819rCW17IUFYRV7nBSKBYsgvaE4ybo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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