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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0267b34cef8db283f692ed822547cd335a7d0e36bc5ad39676b7bf6539454081' 
  AND token = '4KDBsdm8IbU+ApVAbAS6GVUUfKtSwYPP62eGSqTHXPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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