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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951ba30266b9458918be3a9bab2bb7c08f9e267df21f653b14f22f5c59dde2bf' 
  AND token = 'PWvsDOs8m1E2RHLnkjiuIDKhb04s6zur247CnbCc9X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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